Final answer:
The purchase of a new computer by a consumer contributes to GDP by counting only the value of the final good (the computer), while excluding the value of its components to avoid double counting. Option C is correct.
Step-by-step explanation:
When a consumer purchases a new computer, the purchase is counted in GDP by counting the value of the final good, which is the computer itself, not by adding the value of the various components (choice A) or by subtracting the value of the components (choice B).
This is because GDP measures the total dollar value of final goods and services sold for consumption, investment, government, and trade purposes. Intermediate goods, or the components that go into producing other goods, are excluded from GDP calculations to avoid double counting. Therefore, the correct answer to the question is C) By counting only the value of the computer and ignoring the value of the components.